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Related Concept Videos

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Multi-system Monitoring for Identification of Seizures, Arrhythmias and Apnea in Conscious Restrained Rabbits
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Stimulus Sensitive Constant Micro Macro Square-Wave Jerks in a Comatose Patient.

Michael L Rosenberg1, Alejandro Fernandez-Villa2, James McKinney3

  • 1New Jersey Neuroscience Institute (MLR) Edison NJ USA.

Neuro-Ophthalmology (Aeolus Press)
|February 7, 2017
PubMed
Summary

Square-wave jerks, a type of saccade, can occur in comatose patients. These rhythmic eye movements in a comatose patient suggest that their presence does not indicate consciousness.

Keywords:
Comaeye movementssquare-wave jerks

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Neurology

Background:

  • Saccades are typically considered cortical functions, absent in comatose individuals.
  • Intracerebral hemorrhage can lead to severe neurological impairment and altered brain function.

Observation:

  • A comatose patient with intracerebral hemorrhage exhibited continuous, small-amplitude, rhythmic square-wave jerks.
  • These involuntary eye movements had a consistent intersaccadic interval of 130 ms.

Findings:

  • The square-wave jerks persisted despite the patient's comatose state.
  • Eye movements transiently ceased upon auditory or tactile stimulation, then resumed their previous amplitude.

Implications:

  • This case challenges the notion that saccades are exclusively linked to conscious states.
  • The findings suggest that square-wave jerks in comatose patients do not necessarily reflect awareness or consciousness.
  • Further research into the neural mechanisms underlying such movements in impaired consciousness is warranted.